I've made lots of transfers from the UK, but I always get someone else to transfer the money for me. I'm not sure whether you can transfer money to yourself if that's what you want to do because I haven't tried it.
The person making the transfer can pay via bank account, debit card, etc, via the website. But as far as I'm aware you can only pick it up in cash, there's no option to receive the money in a bank account here when sending pounds.
I've sent it several times to myself with no issues. But similarly have never managed to send to a bank account, it's an option on the app that doesn't go through, and isn't offered as an option on the website.
The app works fine for me to send for cash pickup, only caveat is that I used the account and the app before I came to Argentina.